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PORSCHE Panamera Heating Unit (2-zone and 4-zone) |
The heating unit is similar in some respects to the heating unit in the Cayenne. However, as this system provides all areas with air conditioning using one heating unit, the heating unit design is more complex and not comparable.
Heating Unit Air Intake
The fresh-air/recirculation flap and the ram-air flap each have a servo motor located directly beside the air intake opening of the heating unit. The particle filter is positioned at the point where the heating unit’s air intake opening connects with the air-mixing/distribution chamber (view in direction of air movement). To change the particle filter (for maintenance) a service opening is located in the housing of the heating unit (similar to the Cayenne). The opening can be reached by removing the knee guard on the passenger’s side.
Distinguishing between the 2- and 4-zone heating unit by
the number of servo motors:
- A total of 15 servo motors are integrated in the 2-zone system.
- A total of 19 servo motors are integrated in the 4-zone system.
Heating Unit Air Outlet
Only one servo motor is available for extended ventilation.
Both air flow flaps are activated using this drive link.
Heating Unit, Left Side
Additional cold air can be fed to the center vent through a bypass duct). The temperature sensor for the side air vent (one each on the right/left side) is not positioned directly on the heating unit. The sensors are located in an intermediate piece just behind the air vents of the heating unit. This intermediate piece (connector) is an integrated component of the underside of the switch panel and routes the air flow to the air ducts, which serve the side air vents (right/left switch panel).
Heating Unit, Right Side
The servo motor for the temperature mixing flap at the rear is located below position 4. The arrow points only to the connector for this drive link.
Rear Plumbing
Temperature Mixing Chamber (front and rear)
The temperature-mixing chamber is a symmetrical structure. This means that there are temperature mixing flaps for the left and right side at the front and rear (see section on the left side).
Behind the evaporator, the entire air flow is routed separately for the front and rear by the respective temperature mixing flap system (cold and hot flaps) into the temperature-mixing chamber behind. The cold and hot flaps are connected and actuated by a servo motor (temperature mixing flap). All flap positions are adjustable depending on the temperature required.
Example: Cold flap OPEN max = Hot flap CLOSED max
Depending on the setting (automatic or manual mode) the air flows from the various temperature-mixing chambers (four in total) are routed separately through the air flow flaps in the heating unit to the individual vent ducts. An air flow flap for the rear is located in the air distributor.
